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Uppermost part of a radiant furnace (also called the 'bridgewall', a term which came from the original furnace designs and has remained in use). The last area in an upflow furnace before the convection section.

Related Terms

INTERFACIAL TENSION (IFT)

The energy per unit area present at the boundary of two immiscible liquids. It is usually expressed in dynes/cm (ASTM Designation D 971.)

HIGH

An area of high pressure. Since a high is, on a synoptic chart, always associated with anticyclonic circulation, the term is used interchangeably with ANTICYCLONE

HORN ANTENNA

An antenna consisting of a waveguide the cross-sectional area of which increases toward the open end. Often shortened to HORN.

PERMEABILITY

The relationship of flow per unit area to differential pressure across a filter medium.

HOLD-UP

The cross-sectional area locally occupied by one of the phases of a multiphase flow, relative to the cross-sectional area of the conduit at the same local position.

MULTIPHASE FRACTION METER

A device for measuring the phase area fractions of oil, gas and water of a multiphase flow through a cross-section of a conduit.

PHASE AREA FRACTION

The cross-sectional area locally occupied by one of the phases of a multiphase flow, relative to the cross-sectional area of the conduit at the same local position.

ICE COVER

The ratio, expressed in tenths, of the amount of ice to the total area of sea surface in a defined area; this locale may be global, hemispheric, or a specific geographic entity.

SECONDARY COMBUSTION

Combustion which occurs as a result of ignition at a point beyond the furnace.

MULTIPHASE METER

A device for measuring the phase area fractions and flow rates of oil, gas and water of a multiphase flow through a cross-section of a conduit. It is necessary to specify whether the multiphase meter measures volume or mass flow rates.
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